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https://github.com/grafana/grafana.git
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baab021fec
Refactor usage of legacy data contracts. Moves legacy data contracts to pkg/tsdb/legacydata package. Refactor pkg/expr to be a proper service/dependency that can be provided to wire to remove some unneeded dependencies to SSE in ngalert and other places. Refactor pkg/expr to not use the legacydata,RequestHandler and use backend.QueryDataHandler instead.
81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
package alerting
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import (
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"strconv"
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"strings"
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"time"
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"github.com/grafana/grafana/pkg/infra/log"
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"github.com/grafana/grafana/pkg/infra/metrics"
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"github.com/grafana/grafana/pkg/tsdb/legacydata"
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)
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// DefaultEvalHandler is responsible for evaluating the alert rule.
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type DefaultEvalHandler struct {
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log log.Logger
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alertJobTimeout time.Duration
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requestHandler legacydata.RequestHandler
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}
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// NewEvalHandler is the `DefaultEvalHandler` constructor.
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func NewEvalHandler(requestHandler legacydata.RequestHandler) *DefaultEvalHandler {
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return &DefaultEvalHandler{
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log: log.New("alerting.evalHandler"),
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alertJobTimeout: time.Second * 5,
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requestHandler: requestHandler,
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}
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}
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// Eval evaluated the alert rule.
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func (e *DefaultEvalHandler) Eval(context *EvalContext) {
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firing := true
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noDataFound := true
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conditionEvals := ""
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for i := 0; i < len(context.Rule.Conditions); i++ {
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condition := context.Rule.Conditions[i]
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cr, err := condition.Eval(context, e.requestHandler)
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if err != nil {
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context.Error = err
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}
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// break if condition could not be evaluated
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if context.Error != nil {
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break
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}
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if i == 0 {
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firing = cr.Firing
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noDataFound = cr.NoDataFound
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}
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// calculating Firing based on operator
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if cr.Operator == "or" {
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firing = firing || cr.Firing
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} else {
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firing = firing && cr.Firing
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}
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// We cannot evaluate the expression when one or more conditions are missing data
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// and so noDataFound should be true if at least one condition returns no data,
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// irrespective of the operator.
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noDataFound = noDataFound || cr.NoDataFound
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if i > 0 {
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conditionEvals = "[" + conditionEvals + " " + strings.ToUpper(cr.Operator) + " " + strconv.FormatBool(cr.Firing) + "]"
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} else {
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conditionEvals = strconv.FormatBool(firing)
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}
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context.EvalMatches = append(context.EvalMatches, cr.EvalMatches...)
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}
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context.ConditionEvals = conditionEvals + " = " + strconv.FormatBool(firing)
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context.Firing = firing
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context.NoDataFound = noDataFound
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context.EndTime = time.Now()
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elapsedTime := context.EndTime.Sub(context.StartTime).Nanoseconds() / int64(time.Millisecond)
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metrics.MAlertingExecutionTime.Observe(float64(elapsedTime))
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}
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